String variables are added by NVSE 4. A string is simply some combination of text characters and exists widely in the vanilla game. A string variable allows you to store a string in a similar way to any other variable, and a wide range of functions allow powerful capabilities for them.

String variables are very simple to use, provided you also use Let instead of set .. to .. and 'if eval' instead of simply if. To appreciate the full range of possibilites available, a tutorial is available.